單項(xiàng)選擇題拔牙創(chuàng)內(nèi)血凝塊有成纖維細(xì)胞生長(zhǎng),血塊開(kāi)始發(fā)生機(jī)化的時(shí)間是()

A.1天以后
B.2天以后
C.3天以后
D.1周以后
E.1個(gè)月以后